Former Nigerian President Muhammadu Buhari, who led the country twice as a military head of state and a democratic president, has died aged 82.

Buhari - pictured here in 1977 with the then-King of Sweden Carl XVI Gustaf and Saudi Arabia's Sheikh Ahmed Zaki Yamani in 1977 - began his military career straight out of school. By the time this picture was taken, Buhari had risen to become a regional military commander.

Former Nigerian President Muhammadu Buhari, who led the country twice as a military head of state and a democratic president, has died at age 82, his press secretary said Sunday.